Interesting calculations, speculations and results at this moment.
There is another way to double up small amounts of money. The way to do that is through poker. I can add money to a poker account with bonuses and play the number of raked hand and get my money back. There is an evident risk to this method, but it has a tendency to work. The raked hands is usually only 10x the money put in. So $15 = 150 raked hands. Very easy to do and you get $15+ whatever you win. Great way to make small amounts add up!